Starting device for internal-combustion engines.



P. DAIMLER 8; M. FRIZ.

STARTING DEVICE FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED MAY 4 19M.

1 13 6512, 1 Patented Apr 20, 1915.

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P.. DAIMLER & M. .F'RIZ.

STARTING DEVICE FOR INTERNAL COMBUSTION ENGINES. APPLICATION FILED MAY4, I9I4.'

Patented Apr. 20, 1915.

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/1 6. @w O M. yaw/ 46 w P. DAIMLER (MM. FRIZ.

STARTING DEVICE FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED MAY 4, 1914.

1913635120 I v Patented Apr. 20,

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the next cylinder which was AND TED @TATEEB RQUL DAHQLER, 0F CANNS'IATT,

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ASSIGNOLRS TO DAIIEZLEEMOTOEEILGESELLSCHAFT, lJ'Zil'TERTi'iRKHEH/I,

MANY.

STAR ENG DEVEECE F018 ENTERNAL-GOMBUSTEON IINGIIQ'ES.

specification. of Letters Patent.

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Application filed May l, 1814. serial Ito. 8353K.

T all {whom it may concern:

Be it known that we, PAUL DAIMLER, a subject of the King of Worttemberg,residing at Cannstatt, in the German Empire, and Max Fuzz, a subject ofthe King of Wurttemberg, residing at Untertiirkheim, near Stuttgart, inthe German Empire have invented new and useful Improvements in StartingDevices for Internal-Comhustion Engines, of which the following is aspecification.

This invention relates to an improved de-,

vice for starting internal combustion engine's and adapted to enable theengine to be started in any position of the crank shaft withoutit beingnecessary to first of all bring the crank shaft into a certain position.Thegas residues of all the cylinders notopen to the exhaust are drawnoff by the starting device in the known manner and fresh mixturesupplied to the cylinders. One of the cylinders will always be in theexpansion period of its cycle so that on actuatihgthe starting magnetothe first i nition 'will take place in this cylinder and t us set Inimmediate take place previously stopped in the compression period of itscycle and the engine will thus be started.

According to the present invention each cylinder, in addition to havingthe usual admission and exhaust valves, is also succession a furtherignition will the gas residues in the cylinder can be withstarting am isprovided on the the usual admission and exhaust cams. The starting camsare adapted to be put into and out of operation as required and are sodisposed relativey to the admission and exhaust cams that they open theadmission and eduction valves of those cylinders which are not open toexhaust in order to enable the gas residues in these cylinders to bewithdrawn and enable a fresh gas mixture to enter, while the startingcams do not actuate the valves of those cylinders which are open to theexhaust. The gas residues in the cylinders are withdrawn through theeduction valves in the In order that the admission. valve whichstarting,

provided with an eduction valve through which usual manner by 'means ofa manually operated pump.

engine, may also he opened by the admission cam when the engine isrunning normally without at the same time opening the eduction valve, aclutch device is interposed between the lever mechanism of theadniissionvalve and the lever mechanism of the eduction valveiadapted to operatein one direction only.

improved starting device. Fig". 2 is an en larged plan view of thestarting mechanism. Figs. 2 to 2 are crcss sectional views on the line AB of Fig. 2 showing the parts in the various positions they assume.Figs. 3 to 8 are diagrammatic views illustrating the functions of asix-cylinder motor when the small superposed broken-line figures showingthe position of the cams corresponding to the positions of the crank andconnecting rod shown in the'main figures by broken line. Fig. 3 showsthe, position of the pa'rtsduring the expansion period. Fig. 4 shows theposition near the end of the exhaust period; Fig. 5 at the end of thesuction period; the expansion stroke and commencement of exhaust; Fig. 7during the compression pe riod and Fig. 8 at the commencement of thesuction stroke. Each cylinder a in addition to having usualadmission'valve c and 'exhaustvalve (not shown) is also provided with aneduction valve cl through which the gas residues in the cylinder canbewithdrawn. mission valve 0 and exhaust valveare'op erated in the usualmanner by means of ad m'msion cams 1 and exhaust E'niounted on the camshaft 5 which also carries a starting cam 3 for operating the eductionvalve 03. The cam 3 coacts "with enrol-Eercarried by a link f mountedon. a crank-lever 9, 12,, whose arm 7: is connected to e lever Fig. 6 atthe end of i A: operating the eduction valvedi- The hub V g of the cranklever 9 Fe. is mounted torotat-e on-a' pin 6 on "which the huh m"double-armed lever m is rotatahly'niounted, theleyer m being operated bytl'ie ad mission cam 1 and connected to the a, The 'hubs-gand atadmission valve Fig. 2 but are capable of a certain amount of playbetweeneach other so that when the lever m is actuated by the admissioncam it can operate the admission valve 0 without moving the lever g,

without opening the eduction valve (1 whereas the eduction valve (1 canbe opened by the lever g, h when operated by the starting cam 3 if theadmission valve 0 is already open, while finally the'two valves 0 andcan be opened simultaneously by the starting cam 3.

he various positions of the interlocking hubs g and m are shown clearlyin Figs. 2 to 2. Fig. 2 shows the position assumed when the admissionvalve (5 and eduction valve d are closed. Fig. 2 shows the position whenthe admission valve 0 is opened by the admission cam 1 while theeduction valve d remains closed, this being the case when the engine isrunning normally. It will be seen from Fig. 2 that the hub m of thelever m has been turned through an angle a: which corresponds to thestroke of the valve 0. Fig. 2 shows the position which the hubs assumewhen the admission valve cars opened by the admission cam 1 and when theeduction valve d is opened by the starting cam 3. The hubs g and massume the ositions illustrated in Fig. 2 when the a mission valve c-andeduction valve d are simultaneously opened by the starting cam 3.

Mounted .bove the link 7 is a shaft 12 carrying a switch lever 0 andhaving a depending arm 0 which is connected to the link 7 by a bolt 0 Byturning the lever 0 into the position indicated by broken lines, theroller of the lever f is swung out clear of the starting cam 3 asindicated by the dotted circle. In the position illustrated in fulllines in Fig. 1 the starting device is in operative position, the valves0 use 03 being open so that the gas residues in the cylinder may bedrawn oii' through the valve (1 by a manually operated pump connected tothe connection 7), while a fresh gas mixture is drawn in from thecarburetor through the valve 0.

As will be readily seen from Figs. 38 of the drawings the starting cam 3is'so disposed relatively to the admission cam 1 and exhaust cam 2 thatit only actugtqs the valves 0 (l of those cylinders which are not opento the exhaust. Thus Figs. i and 6 show cylinders during their exhaustperiod when the valves 0 (5 remain closed whereas 3, 5, 7 and 8 showcylinders during the expansion, compression or admission when the valves0 fresh mixture will be supplied to the cylinh and consequently v d areopened by the starting cam 3 so that in the positionmacaw ders from thecarbureter through the bpen admission valves 0.

"Although the has been illustrated and describedas applied to anienginewhose cam shaft is axially. fixed it will be readily understood that thedevice I may be also applied to engines of the type in which the camshaft is axially movable in which case the lever mechanism for operatingthe valves may be dispensed with and-the cam shaft provided with aablesthe roller coacting with the admission cam to make contact withthestarting cam. A particular advantage of the improved starting device isthat the engine can started in any-position without manipulation by thedriver thus insuring greater v reliability.

1.111 cilmbination with a multi-cylinder internal combustion enginehaving admis sion and exhaust valves for each cylinder, a startingdevice comprising an eduction valve for each cylinder through which thegas residues may be withdrawn, and mechanism for simultaneously openingthe admission and eduction valves of those cylinders whose'exhaustvalves are closed at themoment of starting the engine and for closingthe eduction valve of the cylinder whose exhaust valve is open at that.moment.

2. In combination with an internal combustion engine having admimion andexhaust valves operated from admission and exhaust cams on a cam shaft,a starting device comprising an eductio'fi valve, and starting cam onsaid cam shaft so disposedrelatively to said cams that the admission andeduction valves are opened when the exhaust valve is closed to enablethe' gas residues in the cylinders to be withdrawn and tune to enter thecylinder.

3. In combination with an internal combustion engine having admissionand exhaust valves operated from admission. and exhaust cams on a camshaft, a starting device comprising. an eduction valve, a starting camon said cam shaft, valve mechanism operatcd by said starting 0am to opensaid admission and eduction valves, said cam be- .ing so disposedrelatively to said admission from the starting earn 3 improved startingdevice transition device which enadmission and exhaust enable fresh gasmix- 7 the cylinders to be withdrawn and enable fresh gas mixture toenter the cylinder and means for putting said valve mechanism into orout of cooperation with said starting cam.

l. In combination with an internalcombustion engine having admission andexhaust valves, a cam shaft and admission and I exhaust valves onsaidcam shaft adapted'to operate said admission and exhaust valves,

a starting device comprising a starting cam on said cam shaft, a pivotedlever adapted to be operated by said starting cam, an ednccylinderoperated by said lever, an admission valve lever pivoted eoaxially withthe first mentioned lever and adapted to be operated by said admissioncam and to operate said admission valve, said. starting cam eing sodisposed rela- 0 tively to said admission and exhaust cams and saidco-axially pivoted levers being so interconnected that the admission andeduction val be opened bi saidstarting cam when the exhaust valve closedWhile mentioned cooperation with said from said exhaust cam, coaXiallypivoted levers adapted to be operated by said'starting an admission camsrespectively, ednction valve in said cylinder, mechanism for connectingsaid admission valve with the lever operated by the admission cam,mechanism for connecting said eduction valve with the other i saidlevers 11g of slight play so that the lever connected Withthe admissionvalve may be operated Without operating the other lever while bothlevers may b said starting cam, and a device tor the lever connectedwith the eduetion valve into or out of cooperation with said startingcam.

In witness whereof we have hereunto set our hands in the presence of tWOwitnesses.

I PAUL DAMILER.

IAX FRIZ. Witnesses ROBERT UHLAND, ERNEST ENTENMANN.

lever, interlocking hubs on

